Systems and methods for filtering fuel

ABSTRACT

A manifold for a fuel filter assembly includes a first base, which may define a first inlet passage to direct flow to a first filter element, and a first outlet passage to direct flow from the first filter element to a second base. The manifold includes a second base, which may define a second inlet passage to receive flow from the first base and direct the flow to the second filter element, and a second outlet passage to receive the flow from the second filter element. The manifold includes a diverting module, which may provide flow communication between the first outlet passage and second inlet passage, such that flow in the first inlet passage passes through the first filter element before entering the second inlet passage. The first and second inlet passages may define a common longitudinal axis. The first and second outlet passages may define a common longitudinal axis.

TECHNICAL FIELD

This disclosure relates generally to systems and methods for filtering fuel, and more particularly, to systems and methods for directing fuel filtration through modules receiving spin-on type fuel filters.

BACKGROUND

Engines, including compression-ignition engines, spark-ignition engines, gasoline engines, gaseous fuel-powered engines, and other internal combustion engines, may operate more effectively with fuel from which contaminates have been removed prior to the fuel reaching a combustion chamber of the engine. In particular, fuel contaminates, if not removed, may lead to undesirable operation of the engine and/or may increase the wear rate of engine components, such as, for example, fuel system components.

Effective removal of contaminates from the fuel system of a compression-ignition engine may be particularly important. In some compression-ignition engines, air is compressed in a combustion chamber, thereby increasing the temperature and pressure of the air, such that when fuel is supplied to the combustion chamber, the fuel and air ignite. If water and/or other contaminates are not removed from the fuel, the contaminates may interfere with and/or damage, for example, fuel injectors, which may have orifices manufactured to exacting tolerances and shapes for improving the efficiency of combustion and/or reducing undesirable exhaust emissions. Moreover, the presence of water in the fuel system may cause considerable engine damage and/or corrosion in the injection system.

Fuel filtration systems serve to remove contaminates from the fuel. For example, some conventional fuel systems may include a primary fuel filter, which removes water and large particulate matter, and a secondary fuel filter, which removes a significant portion of remaining (e.g., smaller) contaminates, such as fine particulate matter. In particular, a typical secondary filter may include multiple filter elements attached to a shared housing. The housing directs fuel flow through the filter elements and out to the fuel system. Multiple filter elements may be attached to the housing, such that a given volume of fuel is filtered by only one of the multiple filter elements. Thus, in a system including a primary filter and a secondary filter, a given volume of fuel is filtered via filtration media twice—once in the primary filter, where water and relatively large particulate matter may be removed, and once in the secondary filter, where relatively small particulate matter may be removed. In some systems, attempts to improve the effectiveness of filtration systems have resulted in providing additional, separate fuel filters arranged with a modified housing to supplement the primary and secondary fuel filters. The complex modification of the housing, however, may be undesirable due, for example, to the increased number of components, requiring repair and regular maintenance, and introduction of potential additional leak points.

One attempt to modify the housing which receives a fuel filter is described in U.S. Pat. No. 7,294,262 (“the '262 patent”) issued to Tadlock on Nov. 13, 2007. Specifically, the '262 patent discloses a modular fluid treatment assembly and method in which modules of the system each have a head that can be connected to one or more heads (of one or more modules) in different configurations. The modules may have a head with substantially concentric inlet and outlet ports in fluid communication with a cartridge coupled to the head. Although the modular filter assembly described in the '262 patent may benefit from its capacity to connect one or more heads in different configurations, the '262 patent presents a system that includes a large number of parts, therefore providing additional complexity and potential leak points for fuel.

The present disclosure may be directed to overcoming or mitigating one or more of the potential problems set forth above.

SUMMARY

In one aspect, the present disclosure is directed to a manifold configured to direct fuel flow within a fuel filter assembly. The manifold may include a first base. The first base may define a first inlet passage configured to direct fuel flow to a first filter element, a first outlet passage configured to direct fuel flow from the first filter element to a second base, and a coupling configured to receive the first filter element. The manifold may further include a second base. The second base may define a second inlet passage configured to receive fuel flow from the first base and direct the fuel flow to the second filter element, a second outlet passage configured to receive the fuel flow from the second filter element, and a coupling configured to receive the second filter element. The manifold may further include a diverting module operably coupled between the first base and the second base. The diverting module may be configured to provide flow communication between the first outlet passage and the second inlet passage, such that the fuel flow in the first inlet passage passes through the first filter element before flowing into the second inlet passage. The first inlet passage and the second inlet passage may define a common longitudinal axis, and the first outlet passage and the second outlet passage may define a common longitudinal axis.

An additional aspect of the present disclosure is directed to a filter assembly, which may include a first filter element configured to filter fuel, a second filter element configured to filter fuel, and a manifold configured to direct fuel to the first and the second filter elements. The manifold may include a first base. The first base may define a first inlet passage configured to direct fuel flow to at least one of the first filter element and the second filter element. The first base may further include a first outlet passage configured to direct fuel flow from the first filter element to a second base, and a coupling receiving the first filter element. The manifold may further include a second base. The second base may define a second inlet passage configured to receive fuel flow from the first base and direct the fuel flow to the second filter element, a second outlet passage configured to receive the fuel flow from the second filter element, and a coupling receiving the second filter element. The manifold may further include a diverting module operably coupled between the first base and the second base. The diverting module may be configured to provide flow communication between the first outlet passage and the second inlet passage, such that the fuel flow in the first inlet passage passes through the first filter element before flowing into the second inlet passage. The first inlet passage and the second inlet passage may define a common longitudinal axis, and the first outlet passage and the second outlet passage may define a common longitudinal axis.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic illustration of an exemplary embodiment of a power system;

FIG. 2 is a schematic, perspective view of an exemplary embodiment of a fuel filter assembly; and

FIG. 3 is a schematic, partial cross-section view of the exemplary embodiment shown in FIG. 2.

DETAILED DESCRIPTION

FIG. 1 illustrates an exemplary embodiment of a power system 10 configured to convert fuel and air into mechanical work. Power system 10 includes an engine 12 (e.g., a four-stroke compression-ignition engine). One skilled in the art will recognize that engine 12 may be any type of internal combustion engine, such as, for example, a spark-ignition engine, a gasoline engine, or a gaseous fuel-powered engine. Engine 12 may include a block 14 that at least partially defines a plurality of combustion chambers 16. As shown in FIG. 1, exemplary engine 12 includes four combustion chambers 16. It is contemplated that engine 12 may include a greater or lesser number of combustion chambers 16, and that combustion chambers 16 may be disposed in any configuration, such as, for example, in an “in-line” configuration, a “V” configuration, or any other known configuration. Engine 12 may include a crankshaft 18 that is rotatably disposed within block 14. Connecting rods (not shown) may connect a plurality of pistons (not shown) to crankshaft 18, so that combustion within a combustion chamber 16 results in a sliding motion of each piston within a respective combustion chamber 16, which, in turn, results in rotation of crankshaft 18, as is conventional in a reciprocating-piston engine.

Power system 10 may include a fuel system 20 configured to deliver injections of pressurized fuel into each of combustion chambers 16 according to a timing scheme, resulting in coordinated combustion within combustion chambers 16. For example, fuel system 20 may be a common rail system and may include a tank 22 configured to hold a supply of fuel, and a fuel pumping arrangement 24 configured to flow and/or pressurize the fuel and direct the fuel to a plurality of fuel injectors 26 associated with combustion chambers 16 via a flow path 28 (e.g., a fuel rail).

For example, pumping arrangement 24 may include one or more pumping devices configured to increase the pressure of the fuel and direct one or more pressurized streams of fuel to flow path 28. According to some embodiments, pumping arrangement 24 may include a low pressure pump 30 and a high pressure pump 32 disposed in series and fluidly connected by way of a fuel line 34. Low pressure pump 30 may include a transfer pump that provides a low pressure fuel feed to high pressure pump 32. High pressure pump 32 may receive a low pressure fuel feed and increase the pressure of the fuel up to as much as, for example, 300 MPa. High pressure pump 32 may be operably coupled to flow path 28 via a fuel line 36.

According to the exemplary embodiment shown in FIG. 1, low pressure pump 30 and/or high pressure pump 32 may be operably coupled to engine 12 and may be driven, for example, via crankshaft 18, either directly or indirectly. For example, low pressure pump 30 and/or high pressure pump 32 may be operably coupled to crankshaft 18 in any manner known to those skilled in the art, such that rotation of crankshaft 18 will result in a corresponding driving rotation of low pressure pump 30 and/or high pressure pump 32. For example, a driveshaft 42 of high pressure pump 32 is shown in FIG. 1 as being operably coupled to crankshaft 18 via a gear train 44. It is contemplated, however, that low pressure pump 30 and/or high pressure pump 32 may alternatively be driven electrically, hydraulically, pneumatically, or in any other known manner. It is further contemplated that fuel system 20 may also include, for example, a mechanical fuel injector system and/or a hydraulic fuel injector system, where the pressure of the injected fuel is generated and/or enhanced within individual injectors, with or without the use of a high pressure source.

According to some embodiments, one or more filtering assemblies, such as, for example, a primary filter assembly 38 and/or a secondary filter assembly 40, may be disposed along fuel line 34 (e.g., in a series relationship, as shown), and may be configured to remove contaminates, such as water and/or particulate matter from the fuel. For example, primary filter assembly 38 may include a filter element (not shown) configured to remove water and/or relatively large particulate matter from fuel received from tank 22. According to some embodiments, secondary filter assembly 40 may include one or more filter elements configured to remove particulate matter from fuel that has not been removed via primary filter assembly 38 (e.g., relatively smaller particulate matter), as described in more detail below. For example, primary filter assembly 38 may include a filter media configured to remove non-fuel liquid (e.g., water) and/or about 10 micron-size and larger particles, and secondary filter assembly 40 may include a filter media configured to remove about 3 micron-size and larger particles.

According to the exemplary embodiment shown in FIG. 2, secondary filter assembly 40 may include, for example, one or more filter modules. Each of the filter modules may include a filter base and a filter element. For example, the exemplary embodiment of secondary filter assembly 40 shown in FIG. 2 includes a first filter module 46, including a first filter base 48 and a first filter element 50, a second filter module 52, including a second filter base 54 and a second filter element 56, and a third filter module 58, including a third filter base 60 and a third filter element 62. One or more of the filter bases 48, 54, and 60 defines a manifold 63 for secondary filter assembly 40. Filter elements 50, 56, and 62 may be operably coupled to respective filter bases 48, 54, and 60 in any manner known to those skilled in the art, such as, for example via a threaded coupling. For example, one or more filter elements 50, 56, and 62 may be spin-on type fuel filters. According to the exemplary embodiment shown in FIG. 2, one or more of filter elements 50, 56, and 62 may include a semi-permeable filter media (not shown) configured to prevent particulate matter of relatively smaller particulate size from passing through secondary filter assembly 40 to fuel injectors 26 (see FIG. 1). As shown in FIG. 2, exemplary secondary filter assembly 40 includes three modules 46, 52, and 58. It is contemplated that secondary filter assembly 40 may be configured to include a greater or lesser number of modules, and thereby receive a greater or lesser number of filter elements.

One or more of modules 46, 52, and 58 may be mounted to engine 12, for example, via a support structure (not shown). The support structure may include any known configuration apparent to those skilled in the art. According to some embodiments, modules 46, 52, and 58 may be configured to be removable from the support structure, thereby permitting replacement or repair. As shown in FIG. 2, secondary filter assembly 40 may include one or more bosses 64 configured to mount secondary filter assembly 40 to engine 12 or to other parts associated with engine 12.

As shown in the exemplary embodiment, modules 46, 52, and 58 may define similar exterior construction, and may be operably coupled to adjacent modules. For example, filter bases 48, 54, and 60 may define a proximal end 66 and a distal end 68 configured to receive adjacent modules. According to the exemplary embodiment shown in FIG. 2, filter bases 48, 54, and 60 may include a flange 70 at both proximal end 66 and distal end 68 and may be provided with one or more openings 72, configured to receive a fastener 74, such as, for example, a bolt and/or a nut.

As shown in the exemplary embodiment, secondary filter assembly 40 may include a diverting module 76. Diverting module 76 may be located between adjacent filter modules. Diverting module 76 may be operably coupled between adjacent modules and provided with one or more openings (not shown) configured to receive one or more fasteners 74. For example, the exemplary embodiment of secondary filter assembly 40 shown in FIG. 2 shows diverting module 76 located between second filter module 52 and third filter module 58. According to some embodiments, diverting module 76 may define similar exterior construction as flange 70, and may be configured to be removable from secondary filter assembly 40, thereby permitting replacement or repair. As shown in FIG. 2, exemplary secondary filter assembly 40 includes one diverting module 76. It is contemplated that secondary filter assembly 40 may include a greater or lesser number of diverting modules 76.

As shown in FIG. 3, filter bases 48, 54, and 60 may include a number of passages configured to direct the fuel flow through secondary filter assembly 40. For example, filter bases 48, 54, and 60, and diverting module 76 may be configured to direct the flow of fuel into and from two or more filter elements in a parallel manner (i.e., such that a given volume of fuel is filtered via a single filter element), or in a series manner (i.e., such that fuel is filtered via more than one filter element prior to flowing out of secondary filter assembly 40). According to the exemplary embodiment shown in FIG. 3, filter bases 48, 54, and 60 may have similar internal arrangements and may be configured to direct fuel flow through filter elements 50, 56, and 62 in a parallel flow arrangement. Diverting module 76 may have an internal arrangement configured to direct fuel flow through filter elements 50, 56, and 62 in a parallel or series flow arrangement. In a combined parallel and series flow arrangement, for example, as shown in FIG. 3, first and second filter modules 46 and 52 may be configured to direct flow in a parallel arrangement to diverting module 76. Diverting module 76 then directs fuel flow through third filter module 58, such that a given volume of fuel received from fuel line 34 may be filtered by first filter element 50 or second filter element 56, and is then directed through third filter element 62 prior to flowing out of secondary filter assembly 40.

For example, first filter base 48 may be configured to direct fuel flow received from fuel line 34 (see FIG. 1) through first filter element 50, and output filtered fuel directly to third filter base 60 without passing through filter element 56. Second filter base 54 may be configured to direct fuel flow received from fuel line 34 (see FIG. 1) through second filter element 56, and output filtered fuel directly to third filter base 60. Diverting module 76 may be configured to direct fuel flow through third filter base 60. Third filter base 60 thereby receives filtered fuel from first and second filter elements 50 and 56, and directs the filtered fuel through third filter element 62, and outputs the twice-filtered fuel to fuel line 36 and/or into high pressure pump 32 (see FIG. 1).

In the exemplary embodiment shown in FIG. 3, first filter base 48 may define an inlet 78, an inlet passage 80, a filter element inlet 82, a filter element outlet 84, an outlet passage 86, and an outlet 88. Inlet 78 may be configured to receive fuel line 34 (see FIG. 1) via a connection, such as, for example, a threaded fastener, press fit connection, or any other connection known in the art. Inlet passage 80 may be in flow communication with inlet 78, and may define a channel that connects inlet 78 and filter element inlet 82. Filter element inlet 82 may be configured within inlet passage 80, such that fuel flow to filter element inlet 82 is directed through the filter media of first filter element 50. Outlet passage 86 may terminate at one end in outlet 88 and may define a channel connecting filter element outlet 84 and outlet 88. Filter element outlet 84 may be defined in outlet passage 86, which is configured to receive filtered fuel from first filter element 50.

As shown in the exemplary embodiment, it is contemplated that first filter base 48 and second filter base 54 have a substantially similar internal configuration. For example, second filter base 54 may define an inlet 90, an inlet passage 92, a filter element inlet 94, a filter element outlet 96, an outlet passage 98, and an outlet 100. Inlet 90 of second filter base 54 may be configured to receive fuel line 34 (see FIG. 1) and/or may be in flow communication with inlet passage 80 of first filter base 48 (see FIG. 3). Inlet passage 92 may be in flow communication with inlet 90 and may define a channel that connects inlet 90 and filter element inlet 94. Filter element inlet 94 may be provided within inlet passage 92, such that fuel flow to filter element inlet 94 is directed through the filter media of second filter element 56. Outlet 100 may be located at proximal end 66 of second filter base 54, remote from inlet 90. Outlet passage 98 may terminate at one end in outlet 100 and may define a channel connecting filter element outlet 96 and outlet 100. Filter element outlet 96 may be defined in outlet passage 98, and may be configured to receive filtered fuel from second filter element 56.

As shown in the exemplary embodiment, it is contemplated that second filter base 54 and third filter base 60 have a substantially similar internal configuration. For example, third filter base 60 may define an inlet 102, an inlet passage 104, a filter element inlet 106, a filter element outlet 108, an outlet passage 110, and an outlet 112. Inlet 102 of third filter base 60 may be configured to receive fuel line 34 (see FIG. 1) and/or may be in flow communication with inlet passage 80 of first filter base 48 and/or inlet passage 92 of second filter base 54. Inlet passage 104 may be in flow communication with inlet 102 and may define a channel that connects inlet 102 and filter element inlet 106. Filter element inlet 106 may be provided within inlet passage 104, such that fuel flow to filter element inlet 106 is directed through the filter media of third filter element 62. Outlet 112 may be located at proximal end 66 of third filter base 60, remote from inlet 102. Outlet passage 108 may terminate at one end in outlet 112 and may define a channel connecting filter element outlet 108 and outlet 112. Filter element outlet 108 may be defined in outlet passage 110, and may be configured to receive filtered fuel from third filter element 62.

In the exemplary embodiment shown in FIG. 3, diverting module 76 may define an inlet 114, a diverting passage 116, and an outlet 118. Diverting module 76 may be configured to prevent the flow of fuel from the inlet passage of a preceding filter module to the inlet passage of a following filter module. For example, diverting module 76 may be configured to prevent the flow of fuel from fuel line 34 via inlet passage 80 of first filter base 48, and/or from inlet passage 92 of second filter base 54, from entering third filter module 58 until the fuel has been filtered by at least one of the filter elements associated with first module 46 and second module 52. For example, as shown in FIG. 3, inlet 114 may be provided adjacent to outlet 100 of second filter base 54, whereby inlet 114 may be configured to receive fuel flow from outlet 100. Diverting passage 116 may define a channel that connects inlet 114 and outlet 118, such that filtered fuel flows from first filter module 46 and/or second filter module 52 through the filter media of third filter element 62 in third filter module 58.

It is contemplated that filter bases 48, 54, and 60, and diverting module 76 may be arranged in a linear configuration (i.e., in an end-to-end configuration), where inlet passage 80, inlet passage 92, and inlet passage 104 may define a common longitudinal axis. Similarly, it is contemplated that outlet passage 86, outlet passage 98, and outlet passage 110 may define a common longitudinal axis. Filter bases 48, 54, and 60, and diverting module 76 may include complimentary protrusions 120 and recesses 122 to aid in alignment (FIG. 3). It is further contemplated that filter bases 48, 54, and 60 may include vent openings 124. Vent openings 124 may be defined in a vent passage 126 along a common longitudinal axis included in filter bases 48, 54, and 60, and/or diverting module 76. Vent passage 126 may aid in the venting of vapor from filter elements 50, 56, and 62. Some embodiments of vent passage 126 may include, for example, a portion configured to direct the flow of fuel vapor is such a way as to create a pressure differential between preceding and following vent passages 126. For example, as shown in FIG. 3, diverting module 76 may include a portion 127 arranged to provide flow communication between an inlet 129 and an outlet 130, such that the flow area defined by outlet 130 is less than the flow area defined by inlet 129. For example, portion 127 may define a truncated conical shape between inlet 129 and outlet 130 (e.g., outlet 130 may define an orifice having a 2 mm diameter).

Pumping arrangement 24 may direct one or more pressurized streams of fuel into first filter base 48, and/or second filter base 54, via inlet 78 and/or inlet 90. Inlet passage 80 and inlet passage 92 may be configured to direct fuel received from inlets 78 and 90, to filter element inlets 82 and 94, respectively, along arrow A. Filter element inlets 82 and 94 direct fuel flow to first filter element 50 and second filter element 56, respectively. Fuel may then flow through first filter element 50 or second filter element 56, which capture particulate matter in the fuel (e.g., particulate matter not captured via primary filter assembly 38). After passing through first filter element 50 or second filter element 56, fuel is directed to filter element outlets 84 and 96, where outlet passages 86 and 98 direct fuel out of first and second filter bases 48 and 54 via outlets 88 and 100, along arrow B.

First filter base 48 and/or second filter base 54 may then direct a pressurized stream of fuel into diverting module 76 via inlet 114. Diverting passage 116 may then direct fuel received from outlet 88 and 100 to outlet 118, along arrow C. Diverting module 76 may then direct a pressurized stream of fuel into third filter base 60 via inlet 102. Inlet passage 104 may then direct fuel received from inlet 102 to filter element inlet 106, along arrow D, where filter element inlet 106 directs fuel flow to third filter element 62. The fuel may then flow through third filter element 62, which captures particulate matter in the fuel (e.g., particulate matter not captured via primary filter assembly 38 and/or first filter element 50 and/or second filter element 56). After passing through third filter element 62, fuel is directed to filter element outlet 108, where outlet passage 110 directs fuel to outlet 112, along arrow E.

INDUSTRIAL APPLICABILITY

The fuel filter assembly of the present disclosure may be applicable to a variety of power systems, such as, for example, compression-ignition engines, gasoline engines, gaseous-fuel-powered engines, and other internal combustion engines known in the art, for example, where the reduction of exhaust emissions and/or improved fuel efficiency, among other things, may be desired. By virtue of using the disclosed fuel filter assembly in association with a power system, more precise control of fuel delivery may be achieved, thereby possibly reducing exhaust emissions and/or increasing fuel efficiency. Operation of exemplary power systems provided with an exemplary fuel filter assembly will now be explained.

Referring to FIG. 1, a supply of fuel is drawn from tank 22 via pumping arrangement 24. In the disclosed example, low pressure pump 30 and the high pressure pump 32 are disposed in series and are fluidly connected by way of fuel line 34. Low pressure pump 30 may include a transfer pump that provides a supply of fuel at relatively low pressure to high pressure pump 32. High pressure pump 32 may receive the low pressure fuel and further increase the pressure of the fuel. One or more filtering assemblies, such as primary filter assembly 38 and secondary filter assembly 40, may be disposed along fuel line 34 and may serve to remove undesirable fluid and/or particulate matter from the fuel. Fuel is drawn through fuel filter assembly 38 via high pressure pump 32 and/or low pressure pump 30, where filter media removes fluid (e.g., water) and relatively large particulate matter from the fuel.

After flowing through primary filter assembly 38, the fuel enters secondary filter assembly 40, where the fuel undergoes additional filtration to remove particulate matter (e.g., relatively smaller particulate matter) that was not removed via primary filter assembly 38. Referring to FIG. 3, the fuel is received at inlet 78 and is directed through inlet passages 80 and 92 to filter element inlets 82 and 94. Thereafter, filter element inlets 82 and 94 direct fuel flow to filter elements 50 and 56, respectively. Fuel then flows through the filter elements 50 or 56, which capture particulate matter in the fuel, providing a first filtration of particulate matter within secondary filter assembly 40. The fuel is then directed to filter element outlets 84 and 96, where outlet passages 86 and 98 direct the fuel flow out of filter bases 48 and 54 via outlets 88 and 100, respectively. At this point, the fuel has been filtered in a parallel manner via first and second filter modules 46 and 52.

Via diverting module 76, fuel is then directed into third filter base 60, where the fuel undergoes an additional filtration (i.e., a series filtration). The filtered fuel received from filter bases 48 and 54 is directed via diverting passage 116 to filter element inlet 106, where filter element inlet 106 directs fuel flow through third filter element 62. The fuel flows through the third filter element 62, which captures particulate matter in the fuel that was not captured via primary filter assembly 38 and/or first filter element 50 and/or second filter element 56. The filtered fuel is then directed to filter element outlet 108, where outlet passage 110 directs fuel to outlet 112 and out of secondary filter assembly 40. The filtered fuel then flows to flow path 28 (e.g., a fuel rail) via fuel line 36 and high pressure pump 32. The filtered fuel may then be supplied to combustion chambers 16 via fuel injectors 26, and the filtered fuel, along with air, may be ignited, thereby producing mechanical work.

The disclosed fuel filter assembly may ensure more complete removal of particulate matter and/or non-fuel fluids from fuel and may provide relatively compact packaging for use in machine environments having relatively limited space. Specifically, directing fuel flow through multiple filter elements arranged in series by diverting the fuel flow by the addition of a component that mates to existing filter base configurations may result in enhanced fuel filtration without requiring additional space and redesign cost. Embodiments where neither manufacturer nor consumer are not required to undertake major retooling or machine reconfiguration while improving product performance allow for increased likelihood that such efficiency updates will be made. Utilized in conjunction with a primary fuel filter assembly, fuel passing through the disclosed filter assembly may be filtered at least three times prior to entering injectors.

It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed, exemplary power system and/or fuel filter assemblies. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed examples. It is intended that the specification and examples be considered as exemplary only, with a true scope being indicated by the following claims and their equivalents. 

1. A manifold for a filter assembly, the manifold comprising: a first base defining a first inlet passage configured to direct fuel flow to a first filter element, a first outlet passage configured to direct fuel flow from the first filter element to a second base, and a coupling configured to receive the first filter element; a second base defining a second inlet passage configured to receive fuel flow from the first base and direct the fuel flow to the second filter element, a second outlet passage configured to receive the fuel flow from the second filter element, and a coupling configured to receive the second filter element; and a diverting module coupled between the first base and the second base, the diverting module being configured to provide flow communication between the first outlet passage and the second inlet passage, such that the fuel flow in the first inlet passage passes through the first filter element before flowing into the second inlet passages, wherein the first inlet passage and the second inlet passage define a common longitudinal axis, and wherein the first outlet passage and the second outlet passage define a common longitudinal axis.
 2. The manifold of claim 1, wherein the first base, the second base, and the diverting module define at least one of protrusions and recesses configured to align the first base, the second base, and the diverting module with respect to one another.
 3. The manifold of claim 1, wherein the first base and the second base define at least one flange configured to couple the first base, the second base, and the diverting module to one another.
 4. The manifold of claim 1, wherein at least one of the first base and the second base includes a boss configured to couple the manifold in operational relation to an engine.
 5. The manifold of claim 1, wherein the first base, the second base, and the diverting module each define a vent passage configured to permit flow of vapor from at least one of the first filter element and the second filter element, and wherein the vent passages define a common longitudinal axis.
 6. The manifold of claim 1, further including a third base coupled to the first base, the third base defining a third inlet passage configured to direct fuel flow to at least one of a third filter element and the first inlet passage, a third outlet passage configured to direct fuel flow from the third filter element to at least one of the first base and the second base, and a coupling configured to receive the third filter element, wherein the third inlet passage and the first inlet passage define a common longitudinal axis, and wherein the third outlet passage and the first outlet passage define a common longitudinal axis.
 7. A filter assembly comprising: a first filter element configured to filter fuel; a second filter element configured to filter fuel; and a manifold configured to direct fuel to the first and the second filter elements, the manifold including a first base defining a first inlet passage configured to direct fuel flow to at least one of the first filter element and the second filter element, a first outlet passage configured to direct fuel flow from the first filter element to a second base, and a coupling receiving the first filter element; a second base defining a second inlet passage configured to receive fuel flow from the first base and direct the fuel flow to the second filter element, a second outlet passage configured to receive the fuel flow from the second filter element, and a coupling receiving the second filter element; and a diverting module coupled between the first base and the second base, the diverting module being configured to provide flow communication between the first outlet passage and the second inlet passage, such that the fuel flow in the first inlet passage passes through the first filter element before flowing to the second filter element, wherein the first inlet passage and the second inlet passage define a common longitudinal axis, and wherein the first outlet passage and the second outlet passage define a common longitudinal axis.
 8. The filter assembly of claim 7, wherein the first filter element is configured to remove particulate matter having a first size greater than a first size dimension, and the second filter element is configured to remove particulate matter having a second size greater than a second size dimension, and wherein the first size dimension and the second size dimension are about equal.
 9. The filter assembly of claim 7, wherein at least one of the first filter element and the second filter element includes a spin-on type fuel filter.
 10. The filter assembly of claim 7, wherein the first base, the second base, and the diverting module define at least one of protrusions and recesses configured to align the first base, the second base, and the diverting module with respect to one another.
 11. The filter assembly of claim 7, wherein at least one of the first base and the second base defines at least one flange configured to couple the first base, the second base, and the diverting module to one another.
 12. The filter assembly of claim 7, wherein at least one of the first base and the second base includes a boss configured to couple the manifold in operational relation to an engine.
 13. The filter assembly of claim 7, wherein the first base, the second base, and the diverting module each define a vent passage configured to permit flow of vapor from at least one of the first filter element and the second filter element, and wherein the vent passages define a common longitudinal axis.
 14. The filter assembly of claim 7, further including a third base coupled to the first base, the third base defining a third inlet passage configured to direct fuel flow to at least one of a third filter element and the first inlet passage, a third outlet passage configured to direct fuel flow from the third filter element to at least one of the first base and the second base, and a coupling receiving the third filter element.
 15. A fuel system comprising: a tank configured to contain a supply of fuel; a low pressure pump configured to route the supply of fuel to a high pressure pump; a high pressure pump configured to raise the pressure of the supply of fuel; a primary fuel filter assembly including a primary filter element configured to remove at least one of undesired fluid and particulate matter from the supply of fuel; and a secondary fuel filter assembly comprising a first filter element configured to filter fuel; a second filter element configured to filter fuel; and a manifold configured to direct fuel to the first and the second filter elements, the manifold including a first base defining a first inlet passage configured to direct fuel flow to at least one of the first filter element and the second filter element, a first outlet passage configured to direct fuel flow from the first filter element to a second base, a coupling receiving the first filter element, and a second base defining a second inlet passage configured to receive fuel flow from the first base and direct the fuel flow to the second filter element, a second outlet passage configured to receive the fuel flow from the second filter element, and a coupling receiving the second filter element, and a diverting module coupled between the first base and the second base, the diverting module being configured to provide flow communication between the first outlet passage and the second inlet passage, such that the fuel flow in the first inlet passage passes through the first filter element before flowing to the second filter element, wherein the first inlet passage and the second inlet passage define a common longitudinal axis, and wherein the first outlet passage and the second outlet passage define a common longitudinal axis.
 16. The fuel system of claim 15, wherein the first base, the second base, and the diverting module define at least one of protrusions and recesses configured to align the first base, the second base, and the diverting module with respect to one another.
 17. The fuel system of claim 15, wherein at least one of the first base and the second base defines at least one flange configured to couple the first base, the second base, and the diverting module to one another.
 18. The fuel system of claim 15, wherein at least one of the first base and the second base includes a boss configured to couple the manifold in operational relation to an engine.
 19. The fuel system of claim 15, wherein the first base, the second base, and the diverting module each define a vent passage configured to permit flow of vapor from at least one of the first filter element and the second filter element, and wherein the vent passages define a common longitudinal axis.
 20. The fuel system of claim 15, further including a third base coupled to the first base, the third base defining a third inlet passage configured to direct fuel flow to at least one of a third filter element and the first inlet passage, a third outlet passage configured to direct fuel flow from the third filter element to at least one of the first base and the second base, and a coupling receiving the third filter element. 